Thermodynamic analysis of supercritical carbon dioxide cycle using waste heat of V18 MAN 51/60DF engine

This study investigates the integration of the supercritical carbon dioxide (S-CO₂) cycle with V18 MAN 51/60DF engines for waste heat recovery in powerships, representing a significant advancement in energy production efficiency. Detailed analysis focuses on the micro S-CO₂ cycle's potential in terms of energy efficiency, environmental sustainability, and economic benefits. The results demonstrate the system's capability to utilize 374.4 kW of heat provided by 1 kg/s air flow, achieving an exergy efficiency of 9.7% and an energy efficiency of 21.8%. The compressor requires 35.51 kW of work, while the turbine produces 89.62 kW, resulting in a net work output of 54.11 kW. The CO₂ mass flow rate is 0.9988 kg/s, and 320.3 kW of heat is transferred to sea water through a flow rate of 0.1231 kg/s. These studies show that the micro supercritical carbon dioxide cycle has great potential in energy production and waste heat recovery and may offer an important innovation to increase energy efficiency, especially in powerships. It highlights the potential of this innovative technology to deliver higher efficiency, lower carbon emissions, and more compact designs than traditional energy conversion systems. These findings indicate that the S-CO₂ cycle can effectively enhance energy production in future projects, offering a promising solution for sustainable power generation.